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C. A. PARSONS, E. BENNETT AND H. ROWE.

MOUNTING 0F REFLECTORS.

APPLICATION FILED SEPT. 6. 1918.

1,309,542. Patented July 8, 1919.

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C. A. PARSONS E. BENNETT AND H. ROWE.

MOUNTING 0 F REFLECTORS. APPLICATION FILED SEPT. 6. 1910.

1 309,542. Patented July 8, 1919.

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C.'A. PARSONS, E. BENNETT AND H. ROWE.

' moumme 0F REFLECTORS.

APPLICATION FILED SEPT. 6. 1918.

1,309,542. Patented July 8; 1919.

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C. A. PARSONS, E. BENNETT AND H. ROWE.

MOUNTING 0F REFLECTORS.

APPLICATION FILED SEPT-6. I9I8.

1,309,542. Patented July 8, i919.

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UNITED STATES PATENT OFFICE.

CHARLES ALGERNON PARSONS, EBENEZER BENNETT, AND HARRY ROWE, OF NEWCASTLE-UPON-TYNE, ENGLAND; SAID BENNETT AND ROWE ASSIGNORS T0 SAID PARSONS.

MOUNTING OF REFLECTORS.

Specification of Letters Patent.

Patented July s, 1919.

To all whom it may concern:

Be it known that We, CHARLES ALoERNoN PARSONS, K. C. 13., EBENEZER BENNETT, and

HARRY ROWE, all subjects of the King of Great Britain and Ireland, and all residing at-Heaton Works, Newcastle-upon-Tyne, in the county of Northumberland, England, have invented certain new and useful Improvements in the Mountings of Reflectors, of which the following is a specification.

The present invention relates to mounting reflectors and particularly to the mounting of reflectors for searchlights.

It has been the usual practice to mount such reflectors upon a number of brass springs bolted to a steel ring, the ends of the springs being so shaped that they embrace the edge of the reflector. The steel ring has been provided with numerous slots or holes through which the bolts pass so that when mounting the reflector the springs can be adjusted to exert as far as possible equal pressures in the direction perpendicular to the plane of the mirror. In practice, however, it is found that the pressure is by no means equalized and the mirror is stressed and its accuracy of figure distorted so that an increase of divergence and irregularity of the beam results.

The object of the present invention is to obviate the necessity for great care in the setting of the springs, and further, to prevent the danger of distortion of the mirror arising from the distortion of the projector ring from heat or other causes.

Reflecting mirrors of telescopes have been supported on systems of lovers consisting of superimposed triangles giving 9, 27, 81, or more points of equal support, or on three sector plates mounted on pivots at their center of pressure and bedded with felt or tallow against the back of the reflector.

According to the present invention, modifications of these principles of support are adapted to the mounting of Searchlight reflectors.

The invention consists in mounting the reflector on a number (3 or a multiple of 3) of supporting members symmetrically placed around the mirror, each supporting member carrying clips embracing the edge of the mirror at equal intervals around its circumference.

The invention further consists in the i1nproved mounting for reflectors hereinafter described.

Referring to the accompanying drawings:-

Figure 1 is a front view,

Fig. 2 a part view of a mounting according to the invention;

Fig. 3 is a front view, and

Figs. 4 and 5 part sections of another form of mounting;

Fig. 6 is a front view,

Fig. 7 is a part section of a third modification;

Fig. 8 is a back view, and

Figs. 9 and 10 details of another form.

In carrying the invention into effect as illustrated in Figs. 1 and 2, we provide three ring sectors a called primary sectors, of suitable cross-section, each surrounding somewhat less than one-third of the edge of the mirror. Each of these primary sectors is pivoted at its center on a pivot 37 attached to the projector ring (Z. To the ends of each sector a. are pivoted at their centers short sector or secondary sector lovers 6, and to each end of these secondary sectors is attached a suitable clip 0 which embraces the edge of the mirror 0 of the metal band 7 which surrounds the mirror. The lengths of the primary and secondary sectors are such that when placed in position the 12 clips are equally spaced around the mirror.

The pivots of the sectors are given a considerable amount of freedom, and it will be seen that the pressure exerted by the four clips supported by each of the three primary levers must be equal both in the direction perpendicular to the plane of the mirror as well as in the radial direction.

Though twelve clips or supports are mentioned, tertiary levers may be pivoted at their centers on the ends of the secondary sectors and clips attached to their ends, thus providing 24 supports, and in the case of small mirrors the clips may be attached to the ends of the primary levers, providing 6 supports.

In the form of the invention shown in Figs. 3 to 5, the primary sectors a are pivotcd on pins 7) in the plane of the edge of the mirror, freedom of movement being assisted by spring washers 7c. The secondary pivots 19 while the inner ends carry pivots 5 for star shaped supports 6, each arm of the supports 6 carrying an asbestos or other suitable pad 7 which supports the back of the mirror. The star shaped supports are adjustable by means of the screw 8. The secondary sectors 6 carrying the clips 0 are mounted as before at the ends of the primary sectors a.

Further, instead of star shaped supports, plates of other form, or triangles, may be used, each extremity carrying a small plate similiarly covered, the position of the fulcrums of the levers being arranged s'o-as to give the desired distribution of pressure between the edge supports and the back supports so as to obviate fiexure of the mirror.

In the form of the invention shown at Figs. 8, 9 and 10, the primary sectors 04 are mounted on pivots 79 fixed t0 the rear edge of the reflector ring h, and carry at their. ends the pivots 11 of the secondary sectors 1). The secondary sectors at their centers are provided with rounded projections 12 to allow movement in planes passing through the pivots; long clips 13 to embrace the edge of the mirror are fixed to the ends of the secondary sectors. A stay 1 1 is fixed acrossthe reflector ring it at the back 'of the mirror.

Oh a projector wherea mirror ring cannot be applied, brackets carrying thes'ectors may be fixed to the proj ector back.

Though pivots have been described, ball and socket or other means of flexure may be used, suitable means beingprovided to limit the motion in certain directions to secure the steadiness of the mounting.

It will be seen that it is not essential with this mounting that the springs should be carefully adjusted and no ordinary deformation or expansion by heat of the projector will cause distortion of the reflector.

Having now described our invention, what we claim as new and desire to secure by Letters Patent is 1. A reflector, mounted on a number of pivoted supporting members symmetrically placed around the mirror, 'ea'ch supporting member carrying ,fclips embracing the edge of the mirror and bearing on its front and rear surfaces at equal intervals around its circumference, substantially as described.

2. A reflector mounting comprising a number of primary members pivoted on fixed supports, eachprimary .member havingpivoted thereto secondary members car- ;zrying at their ends clips embracing theedge of the mirror, substantiallyas descrrbed.

In a mounting as claimed inclaim 1, supports for the backconsisti -ng of pivoted plates or the like bearing at'threepoints against theback of the mirror, substantially as described.

4. A reflector mounting, comprising levers pivoted to the reflector ring or other fixed support carrying at their outer ends pivots for primary sectors which carry secondary sectors embracing the ends of the mirror, such levers carrying attheir inner ends pivoted members pro'vldedwith three supports bearing against the back of the mirror, substantially as described.

In testimony whereofwe have signed our names to this specification. a I

oanurs A ERLION masons. EBENEZERBENNETT. HARRY ROWE.

Gopies of this-patent may be obtained for-five cents each, by addressing the Commissioner of-P atents, Washington, D. 0. 

